Design Of Piezoelectric Inkjet Printing Control System Based On FPGA

In modern manufacturing industry,there are more and more applications of inkjet printing,and the requirements for printing efficiency and customization have been improved rapidly in industrial production.As one of the core modules of the printer,the performance of the control system directly affects the performance of the head.The domestic systems often focuse on some simple heads.These systems have no expansibility for complex heads with more nozzles and are not universal based on shallow ideas,so it is difficult to meet the actual requirements of industrial scenes.The drive control system designed in this paper is applied to Ricoh GEN5 nozzles,which fully utilizes the parallel character of the FPGA,supports the future multilevel expansion,and has strong waveform adaptability,high-speed data-transmission and can meet the needs of high-speed GEN5 head.The main contents of this paper are as follows:Firstly,the working mechanism of inkjet control system is studied.Beside the design of printing control system,this paper focuses on the parallel control of high-speed data transmission and complex driving signals.This paper also analyses the specific working principles of different nozzles and analyses the output of piezoelectric nozzles,and studies the driving modes of various nozzles.What's more,the control signals,waveforms and corresponding timing requirements of GEN5 nozzles are analyzed.Secondly,this paper designs the head control system based on FPGA.This paper design the overall architecture of the control system by using FPGA as the main control chip,combined with the drive control system and data transmission scheme for GEN5.Then,unit design is carried out according to the functional division of the system.The hardware circuit part realizes the design of drive board,including optical fiber data transceiver,main control chip of FPGA,wave output,head connector and so on.The logic circuit part includes the program design and functional simulation analysis of data transmission,trapezoidal wave generation,timing control and other modules.Then,this paper focus on the parallelism and timing requirements of the system,and the theory of cross-clock domain and timing optimization in the design of FPGA is studied.The optimization theory is applied to the logical design of the system.The wave generation unit,optical fiber transceiver and other parts are optimized,which provides enough margin for the actual operation of the system.Finally,experiment verification and result analysis are carried out.By grabbing the outputs of the key modules in the FPGA and testing the actual output waves and control signals of the driving board,all results show that the control system designed in this paper can meet the requirements of GEN5.It also shows that the control system designed in this paper with the core of FPGA has good control effect and expansibility,and can be used for related complex sprinklers,and provide some idea for the design of nozzle drive systems.